\begin{tikzpicture}[>=Stealth,]
    \coordinate (O) at (0, 0);
    \pgfmathsetmacro{\jiao}{30}

    \draw (O) -- +(3, 0) node [above] {水平线};
    \draw (0, -1) -- (0, 1) node [midway, left, align=center] {铅\\[-0.5em]垂\\[-0.5em]线};

    \pgfmathsetmacro{\jiao}{20}
    \pgfmathsetmacro{\r}{1.0}
    \draw [->] (O) -- (\jiao:2.5) node [right] {视线};
    \draw (0:\r) arc (0:\jiao:\r) node [pos=0.7, right=0.5em] {\small 仰角};

    \pgfmathsetmacro{\r}{0.7}
    \draw [->] (O) -- (-\jiao:2.5) node [right] {视线};
    \draw [double] (0:\r) arc (0:-\jiao:\r) node [pos=0.8, right=1.0em] {\small 俯角};
\end{tikzpicture}
